In Helm 2.6.0, the new delete feature that deletes old versions of
charts is deleting subcharts that aren't in requirements.yaml.
In this patch, I judge the dependency whether it is included in the
requirements.yaml before deleting it.

Closes #2830

fix(helm): fix flag parsing once and for all

fix(dep): Fixes out of date dependency info

The help text for `helm dep` contained out of date info about
referring to a chart repo by name vs. URL.

fix(helm): fix `helm get` subcommands

This correctly sets up the tunnel for `helm get values`, `helm get
manifest`, and `helm get hooks`.

Closes #2617

fix(helm): support HELM_HOME during plugin loading

fix(tests): fix sorting hooks test flake

closes #2630

fix(helm): load home from flags during runtime

Fix a bug causing 'helm depndency update' to delete required charts

ref(tests): simplify kind sorter test

Add the "APIService" kind to the installation sort order

fix(docs): run docs generator

fix(semver): Prerelease number comparison issues

In prerelease numbers there was the potential for number comparison
issues. For example, 99 being greater than 103. This is now fixed.

feat(helm): add -a flag to 'helm list'

There's 'helm get values -a' already. I always try to use 'helm list -a'
spontaneously.

Allow deletion of a previous values file key

Test that the coalesced key is properly removed for all YAML null syntax options, but not for empty string

- Note that this covers all YAML null syntax options:
  ref: http://yaml.org/type/null.html
- Note that we do a nil comparison because the encoding/yaml package parses
  YAML properly and any variation of null, Null, NULL, or ~ is converted to nil
  by the time we get here.

feat(*): use kubernetes 1.7

Adds charts in "charts\" directory to dependencies

This ensures that APIService resources are installed last and
uninstalled first

Remove mention of the Service type from the ingress documentation

Capitalize 'helm' text in init.go.

[scripts/get] makes sudo an optional dependency